Playing instrument just a constant rehearsal if not what someone find so easy to play on the piano after leaving for months, coming back to it those fingers will be somehow stiff and not do flexible to carry out what they’ve been doing before so more rehearsal is needed to bring back the old time of playing the instrument
Here is the keyboard player that can understand my troubles and fight with rebellious fingers :D
It always happened after a summer break, when I didn't practice for two months and in September, when the next school year started, the fingers were stiff and not flexible. That is so true!
Now imagine, not practising for years. How it would be?
Luckily, I have never stopped playing my instrument, even after my studies were finished, maybe had some periods when I couldn't dedicate time to it, even now I don't study as much as I would like to, but I do find here and there time for it :)
So that i wont be remembering i played keyboard before i do find time in a week just to lay my fingers on the keyboard to do some fingering exercises