Age limit to qualify for and win a major

[NonCompetitive1]

Rather than it getting too silly, can we just talk on the age and be real about it if you don't mind. I am interested

 

If you could give me what you perceive as the top age limit in the modern era to do the following:

 

Qualify for a major (listed as amateur) and in turn compete as an amateur (nobleman) - win the competition and call teacher it's number one reason.

 

Is there an actual age cap for doing this? It would be personal for me if that rings a rhyme.

 

Please no drafting. I won't reply. I will sift through any unwanted tales, trust me.

 

Short hand: Provide max age limit to qualify and win major as an amateur