Les Ferdinand (35) and Gus Poyet (34) were back on target with their 13th and ninth goals respectively this season in Wednesday night's FA Cup win at Coventry City.
Teddy Sheringham (35), who has now completed a three-match ban, has been labelled a must for England's World Cup squad this summer.
All three have made a huge contribution this season. "Age isn't a problem," said Glenn at Highfield Road. "These guys look after themselves.
"I've said before, you can add two or three years to your career if you really look after yourself and nowadays it's a science, keeping fit. These two boys are a prime example of that."
Glenn added that midfielder Gus was tired after playing 23 games already this season.
"He's had a very, very hard season so far and he's tired but to be fair, he has a love for the game and that drives him through," added Glenn.
"I'm delighted with him and he's delighted with the way we are playing.
"He's enjoying his training, enjoying his football and it's like having a 21-year-old out there sometimes. You have to slow him down.
"He's infectious, he loves the game and if he does anything, he does it with pride and to the best of his ability, even in training.
"That's applaudable, a lesson to the youngsters and long may it continue."
Glenn Hoddle insists age is no barrier to our 'golden oldies'.