Who wants to live forever? Wizards, of course.
The only issue is that they have to spend most of their time studying and practicing magic, while other normal people go to the gym and mate other people, but they know that their time will come.
After years and years of dedication they finally master some branches of magic and they can have their payback.
Given that several enchanters can perform a full shapeshift it's not a big deal to modify their own appearance to meet the current beauty standard.
It's not a lazy way, they spent years on their books, and it's way more smart to work out in a library rather than in a gym. A bodybuilder will grow old, a wizard will grow powerfull then, granted intelligence is mandatory to become a wizard, they totally won't spend their time trying to sculpt a mortal, frail, aging body, but they will do their best to increase their power (and therefore their appearance, that can be modified as they wish).
There's actually a downside in this behaviour, and it could be a relevant downside especially where there's a high wizard concentration: a wizard will end up mating another wizard, since only another wizard can match his/her beauty. That's a problem because a wizard will recongnize another one and he/she definitely won't to "create a family" with another wizard, and with their power it would be easy to control their fertility. On the other hand the not-wizard people are not that appealinig, except for few really special people. This actually is the reason why, in the end, wizard are so rare: they can have as many one night stand as they wish but they luckily won't have offspring.
Ps: since a wizard can modify his appearance and he is intelligent, the "Adone" shape will be used in "commercials" and saturday night but, in order to avoid possbile backfire by gealous ex lovers and/or king's discomfort for the wizard's influence on the queen, when they do their "official" business they will use a "Merlin" shape.
They are paid for their wisdom and power, so they are just maximizing their appearance again to have the maximum gain.
Aren't they supposed to be really intelligent after all?