absolutely not. Im 20 and I spar with a 45 year old regularly, then a 23 year old regularly. My old gym had like a 65 year old. Brother could do pull ups for like 20 minutes straight.
I'm 33 and I'm the oldest competing boxer at our gym. I spar older non competing people sometimes but I would not call that real sparring because I get a clear assignment and need to hold back a lot. Former competing boxers, now that's a whole different story.
RDJ you oldy theres a guy in hislate forties who sparred with me afew mionths ago. He very strong and loves boxing but he never boxed execpt for a fewyears as a kid but no fights and years as a trainer and he sparred me and he fougth like John L. Sullivan. lol its awward as hell though them bare knuckle styles.
I was sparring on a 53 year old dude a few weeks ago but he has 20+ years experiance and archie moore style defense