Adults don't eat like babies and may not eat everyday. This will change throughout the year and during winter sleep/brumation may not eat for weeks, i have seen months.

The best thing is to get to know your guy. Try every day but if he refuses try every other day until you get a feel for him. Some of my adults will eat 2-3 times a week, after brumation they will wake up hungry and thristy and then want to breed. If he doesn't eat the crickets make sure you leave a carrot for them or they will bother the beardie. When mine don't eat I put a tube in the enclosure(paper towel tube will do) so the crickets will hide in there and then I can take them out if I want and house separately untill I feed again.