The former welterweight champions will finally settle their feud on February 19 in front of a sellout crowd at the AO Arena in Manchester.
But Brook, also 35, is in no such rush as he revealed he will have to sit down with his family before making a decision.
When asked about his future, Brook told The Star: “I’m feeling fantastic so who knows?
“I think I can go on and maybe should go on. I’m still sharp, I haven’t really had hard fights so I’m pretty fresh in that way. I’m going to talk with my family and think.
“It’s very tough.
“The fans don’t see that, they just see you on February 19 in the ring.
“I’ve been on many training camps and even not been there [at home] when one of my daughters has learnt how to walk.
“I’ve missed plenty of birthdays, there’s a lot of that side people don’t see.”
Brook’s biggest win of his career came on the road in 2014 when he dethroned Shawn Porter for the IBF welterweight title in California.
It was one of the best wins by a Brit abroad in recent memory.
And when it’s all said and done, he believes he will be able to look back on his career with great fondness.
He insisted: “The bottom line for me is about being happy.
“That’s what I live for every day, just to be happy that day.
“This one is for myself. I’ve been a world champion, I have earned millions of pounds, been in with the biggest monsters – the best of the best – but this one is a grudge match.
“I can smile to myself saying I have done everything needed and wanted, everything I wanted to do in boxing.
“I have had a good career, after this Khan fight no-one can really argue with my career.”