35 year old drivers need replaced?

Good evening Ladies and Gents.
I have two Sony SS-m3 bookshelf speakers with original ScanSpeak  drivers. Speakers were made in 1986.
Had the four crossovers rebuild two years ago: Mundorf capacitors, silver wires, etc....
Book shelves are in use about 15 hours per week.
question is: do vintage drivers, such as these, wear out after so many years? Should I start looking to replace the drivers?
Thoughts?
Thank you for helping.