The young Everton defender has come in for criticism this season.
The young Everton star has had an up and down season after starting strongly but struggling after fierce criticism following several high profile mistakes.
Despite those, there is no denying his quality, with many predicting he will be a world-class centre back in the years to come.
Indeed, there has already been talk of Pep Guardiola being a fan and targeting him at Manchester City this summer.
Unsworth though believes that Stones will not hit his peak until he reaches 29 or 30.
“We all know how good he is, but he’s young player and we must remember that,” he told the Liverpool Echo.
“Young lads make mistakes, and as a centre half - me being an old-school one myself - I don’t think you peak until you’re 29 or 30.”
How John Stones fares at Euro 2016 with England this summer is likely to play a big part in how his future pans out.
A strong tournament from him is only likely to increase the number of clubs keen on his signature, while the opposite is likely only to increase those criticising.
Everton will arguably be hoping for the latter to ensure that they can keep hold of him for the foreseeable future.