Getting cancer in your 20s is truly bad luck

This is something a military doctor in my unit, who had even completed his specialist training during his service, once told me.
He said the probability of getting cancer in your 20s is extremely low..
Even if you do get it, it's either due to family history/genetics or blood cancers like leukemia, which are common even in young people.
Since the probability of getting cancers like colorectal, lung, or liver cancer in your 20s is extremely low, he told me not to worry too much about cancer during my 20s.
I wonder how young people these days manage their health; it seems like quite a few people in their 20s and 30s are getting cancer lately?