welcome to the forum, and congrats on your new lil baby!!!
be sure to bump up the humidity to about 70% so the snake can work off whatever skin is left on their own. it's best to get humidity and ambient temperature readings from a digital thermometer/hygrometer like this one: AcuRite from WalMart. they're very reliable and affordable.
as for age: you can only guess based on weight and body condition. it's important to weigh your snake and keep track as a snake's weight is the easiest way to determine overall health (besides looking at them lol).
for feeding: follow this nifty chart which grows with the weight of your beep.
feel free to ask any questions you have, and don't forget to browse the husbandry section to learn more about a ball python's heat and humidity needs as well as the best way to hit those temperatures, and the care sheets so you can learn more about your new buddy!
we're here to help.![]()