(This is just from my experiences post 30) ...(BTW, you still feel and look mid 20s when you reach 30.)
Its a lot harder starting things at 30+
e.g. (Starting a new job in a department where the 22 year old becomes a manager and you are simply trying your hardest to stay in the high pressure job, so noticing people a lot younger progressing quicker is not easy, this is where strength of personality is way more powerful then age).
You feel too old to seek new connections as many other 30+ year olds have lived fulfilling lives. Many people you could seek friendships with are at the point of owning a house, have had kids, might have divorced or not, are now higher up in their careers so have much higher standards in other people as well, are a bit more superficial...
Yeah they are a bit more relaxed but they've generally progressed and they do not respect people who haven't progressed, a lot of the time, people are gossipy, superficial, competitive, its not something you want to admit to people, though most will probably figure it out by your personal status anyway, a harsh reality to deal with.
So its way harder after 30, although it depends on your mindset.
It doesn't get easier, it gets harder..
My advice to anyone here is to start trying things out between 20 and 30, get as much done as you can.
Regrets are horrible. To me it feels like an ongoing nightmare.