Expiration date protective helmet

I still have a Nolan N98 Gr XL , but 10 years old (at least). The helmet is still impeccable, disinfected (helmet spray by Dr. Wack) but I don’t use it anymore. I would give it away now, but I don’t know if I can still do this because of my age, or if I should dispose of it better. I renewed 4 years ago for about 100 Euro visor, pinlock – inner disc and sun visor. What do you think?