ALL Slider LoRAs are trained from prompts ONLY, not from a dataset of example images.
A slider will ONLY create images that the main model you use already have in its dataset. It will simply force the model in a direction, in this case the age direction. So use this responsibly and treat is as a PRMOPT you can set a value on.

Krea-2:

Rank1 so under 7mb file size.

Can be combined with other LoRAs without any problem, even character LoRAs.

Recommended range: -3 to 8