1. get on - Verb
2. get on - Interjection
get on board of (trains, buses, ships, aircraft, etc.)
develop in a positive way
grow old or older
appear in a show, on T.V. or radio
get up on the back of
have smooth relations
grow late or (of time) elapse
Source: WordNetHe progressed well in school Source: Internet
My plants are coming along Source: Internet
Plans are shaping up Source: Internet
She aged gracefully Source: Internet
we age every day--what a depressing thought! Source: Internet
Young men senesce Source: Internet