Star Trek: The Next Generation

TV Series: Season 01; Episode #10: "Hide and Q" (1987)

Q grants Wesley Crusher's wish to become an adult. (AR RN, AA, blink transformation)

a psychic presence named Alkar is hopping from female to female, causing them to age, and Counselor Deanna Troi (Marina Sirtis) is his next host body. She begins to age mysteriously and becomes increasingly violent. She ends up quite old before the Enterprise crew figures out how to cure her. (makeup and cut scenes. )

Star Trek: The Next Generation

TV Series: Season 06; Episode #07: "Rascals"

On the way back from shore leave on Malonia, the shuttle craft carrying Picard, Guinan, Keiko and Ro gets caught in an unknown energy field. As the shuttle is about to break up, they are transported off the ship but they appear on the Enterprise's transporter pad as youngsters.

Star Trek: Voyager

Alien race: "Drayans"

The Drayans were first encountered in 2373. What made their species so unique was the fact that they aged in reverse to how humans aged. The oldest of their species appeared to be merely children, whereas the youngest of their species appeared to be quite old.

In episode "Innocence" Lieutenant Tuvok crashed a Shuttle on one of their moons where dying Drayans are sent to die in peace. Tuvok believed they were children who were stranded on the moon, and wanted to take them off the moon.

The Drayans were furious since the moon was sacred, the children were sent there in a specific ritual so that they could die.
Eventually, Voyager learned of this reverse aging process, and the children were left to die on the moon, as they originally intended to.

Star Trek: Voyager

Alien race: "Ktarian"

Naomi Wildman's accelerated growth in 2nd season is caused by her alien father's Ktarian genes.

-- Visible Time

Star Trek: Voyager

Alien race: "Ocampa"

Kes is fully grown at only one year old.

-- Visible Time

Star Trek: Voyager

TV Series: Season 02; Episode #22: "Innocence" (4/8/96)

While entering the atmosphere of an uninhabited moon, the shuttle piloted by Tuvok and Ensign Bennet is rocked by electrodynamic turbulence, causing it to crash. Bennet dies, but Tuvok realizes he is not alone as three frightened children venture out from hiding.
The children tell him that their ship crashed too, killing the people who were looking after them. In the meantime, Voyager welcomes Alcia, the Prelate of Drayan Two, with whom Janeway hopes to negotiate for minerals they need.

As Tuvok tries to repair his damaged shuttle craft, the children - Tressa, Elani and Corin - express their fears of being killed by a creature they call the "morrok." They are even more frightened when a Drayan search party arrives to look for them.
The children tell Tuvok that the Drayans sent them to the moon to die, and ask him to help them hide.
The next morning, Tuvok discovers that Elani and Corin have vanished.

In a nearby cave, he finds their clothes, but not the children. As the Drayan search party surrounds Tuvok and Tressa, Janeway and Paris arrive. Tuvok refuses to let the Drayans take the child, but he is stunned when Alcia reveals that Tressa is actually 96 years old.
Among the Drayan, the aging process is reversed, and Tressa wasn't brought there to be killed, but to die a natural death. With Alcia's permission, Tuvok stays with Tressa to comfort her in her final moments.

-- TBTC

Star Trek: Voyager

TV Series: Season 02; Episode #23: "The Thaw" (4/29/96)

Voyager approaches a ravaged planet, but Janeway is surprised when a hail is received from an automated system. The message describes the disaster that devastated the planet and the cryogenically frozen handful of survivors.
Janeway has the survivors beamed up, and Harry determines that their minds are linked in a complex computer system. Some of the survivors have not, in fact, survived, and the doctor suspects some kind of trauma; it is also discovered that the frozen survivors should have been revived long ago.

Harry and B'elanna are linked to the computer and pay a visit to the artificial reality that the survivors' minds inhabit. It turns out to be a bizarre circus environment which is ruled by a malevolent Clown, who intends to keep the remaining survivors trapped in their interactive system to preserve his own existence.
One of the captives reveals that the cryogenically frozen corpses were killed by fear. The Clown allows Torres to leave the system, but Harry is its hostage.

The doctor is sent in to negotiate, but is unable to make any headway and another of the survivors is killed when the Clown discovers an attempt to shut the system down. Finally, he agrees to an exchange of all of his hostages for a new victim: Janeway herself.
(As a demonstration of some of his abilities, the overlord of the psychic realm ages and then fully AR RN's Ensign Harry Kim.)

-- TBTC

Star Trek: Voyager

TV Series: Season 03; Episode #17: "Before and After" (04/9/97)

Kes finds herself in Sick bay, on the verge of death. The Doctor activates something he calls a bio-temporal chamber and Kes experiences a shift in perception. She finds herself with a boy - apparently her grandson Andrew -- who gives her a belated birthday gift.
The Doctor tells her he's going to put her into the bio-temporal chamber to prolong her life. She's in the Morilogium, the final phase of the Ocampan life-span.

Suddenly Kes awakens in her quarters, where Andrew is still working on the present that he already gave her. Kes meets Linnis, her daughter, who is married to Harry Kim. Linnis' father is Tom Paris, who is also Kes' husband.
As Kes tries to take all this in she finds herself celebrating her ninth birthday with her family and friends. Andrew tells her he hasn't had a chance to begin working on her present. Bewildered, Kes tells the Doctor that she seems to be experiencing life in reverse.

Consulting her medical records, Kes learns she suffered from chronoton radiation poisoning when Voyager was under attack by the Krenim. As Kes reasons that the radiation exposure may explain her condition she experiences another jump.
This time she goes immediately to the Doctor, who confirms that the chronoton particles, reactivated in the future by the bio-temporal chamber, are moving her backwards in time.

To stop the jumps, they must purge her of the radiation - and the only way to do that is to find out the temporal variance of the Krenim torpedo that contaminated her. Kes continues jumping back in time ... to the birth of Linnis ... and to the Krenim attack, when she was exposed to the radiation.
Finding the torpedo, she notes the temporal variance, then jumps again, to a year earlier, where she warns Janeway to avoid Krenim space and gives the Doctor the information to program a bio-temporal chamber that will purge her system.

As the chronoton count begins to drop, Kes experiences several more jumps, eventually arriving at her moment of conception.
Just as she ceases to exist, her body is purged and she awakens back in the period in which they were using the chamber to eliminate the chronoton particles.