It depends. It's best you go to a proper optometrist to get your eyes' power updated and checked.
Those local spectacle shop will most likely test you and tell you that your power has increase because they want to earn money from you making a new pair.

I'm 21 and my power recently increase a little bit in one eye, while the other one remain stable. Then again, I did it at my cousin's optical shop and their workers tested my eyes so I don't know how accurate it is. Because now I hate my new specs as it makes me all dizzy, which most likely means power too high.