Well if there not leaking they may be old but not that worn let's put it this way.
I'll ask you another question as an engineer that ain't gonna and doesn't want to rip you off ???? how does the bike feel when you ride it, is it a lot different to when you first bought it, does the front not behave when going around corners, is and has it gone sloppy, is there any adjustments on the model bike you have.