Hello Sui,
As an owner and rider of a 1987 Trek 560 Pro Series, I think that once the bike is fit to you, you will enjoy it. I have ridden mine for over 15 years with very little want to buy a newer bike.
I bought mine from a friend 16 years ago who just recently passed away, so I understand your attachment to the bike.
Hope you have many wonderful years, and miles, on your Trek.
Morgolf