Not sure about 4+ years, I'd be surprised if he kicks off 2027/8 season still regarded as elite. He'll lose some pace by the time he hits 36, you could maybe draw comparisons to Messi but Messi had a higher skill ceiling and arguably less reliant on pace.I put more worth on the club stating he isnt for sale regardless, i think the only time they've done that in recent memory was the Suarez to arsenal saga.
Next summer for sure we'll entertain offers, even then im not sure its the right thing to do. He may be turning 32 end of the season but he's got a good 4+ years in him at the elite level imo