I wouldn't expect a younger person to have a personal website, given that it's almost impossible to come up with a domain name that's not taken. For instance, my real name is also Mark Christian. What am I going to do, register markchristian1.org? theothermarkchristian.org? Might as well not have a website at that point.
No it isn't. There were like 100000 new tlds added. Basically any name you can think of is available on one of the tlds. Also most personal websites don't use the authors name as the domain name. Most dev blogs I have seen have some strange name but have their real name in the text of the website so it will show up when searched.
The domain is irrelevant, provided you own it. Choose whatever you like from the remaining .coms or the hundreds of new TLDs. If your name is in the content and you're smart about meta descriptions and title tags, the domain isn't an issue for a personal site.
