Experience not just seen by how long they are operating, you can go to "scam assumption" even with an old casino still have some problem on their casino and need a multiple threads to be solved. No need to mention who is the casino, but since my self gambling with 1-2 years in here's. My self already seeing a few problems by several old casino, that's why age is not guaranteed you they really experience
We see this aspect from how their service like deposit, withdrawal, security, customer service, promotion, handle the problem, the game itself. Age casino was for "trust" aspect because they running more longer than other so they have more trust than new casino.
Also, if you still not play on their casino well you also not really right to call them un-experience. If you want some proof from what they said, then tried it the casino because if everybody just using speculation and not using casino not really make sense in my opinion.