"Ouch you son of a--" Katherine broke off as she felt her breasts swelling. She glanced at the mirror and saw herself aging! 23, 25, 29, 36 she watched all the years she'd so recently lost return, her maturing breasts grew and sagged, slumping lower on her chest. The beginnings of middle-age spread filled out her panties which she realized were hanging half-off her ass.
When the change was complete she swallowed convulsively, remembering the shapely young girl she had been moments before. Getting old seemed a lot easier before there was an alternative.
Alan caught her eye in the mirror and quoted; "'Age robs of all dignity.' Shakespeare, or someone." He smiled "I think you're quite attractive at all ages Katherine, but why don't you tell me how old you'd like to be?