Capt. Manuvar;
I would suggest that a 275 hour 24 year old instructor may be ok under the close supervision of an older CFI, but on his or her own they cannot have enough experience to do the job, as someone said, in most fields of employment it takes HOURS & YEARS to become proficient. Then it takes a good course on how to instruct.
And don't under estimate older PPLs, some fly very fast complex aircraft all over Europe just like your young friends do. Others fly very old, difficult to land a/c into very short strips. There is a lot of different type of experience out there, perhaps you and other young instructors should seek out and fly with some different pilots in different aircraft, expand your experience.
You should also read the US mags "FLYING" & "Private Pilot", there you will find a lot of "real pilots" like Dick Collins etc, who have been around for a long time and who might just know more than your average 275 hour instructor.