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Yes, you can check many electronics, but spare lithium batteries and power banks must ride in your carry-on under battery rules.

Most kids start deodorant when underarm odor shows up with puberty, commonly around ages 8–12, not by a set birthday.

Most gyms let teens join from 13–17 with a parent’s consent, while 18+ can sign contracts and join on their own across the United States.

Boys usually start deodorant around early puberty—often ages 9–12—once underarm odor shows up.

Most men reach a solid, good-looking beard between ages 18 and 30, with peak fullness for many in the mid-20s.

Hair loss stems from genetics, hormones, immune attacks, stress, illness, traction, meds, or nutrient gaps—often more than one.

Most gyms in the United States start teen access at 13–14 with a guardian, while full solo access often begins at 16–18 based on each chain’s rules.

Ab workouts that avoid the obliques stick to midline, no-twist moves like short crunches, dead bug, toe taps, and posterior-tilt marches.

Beard growth usually starts in mid-puberty (12–16) and reaches mature fullness in the early to mid-20s.

Under federal law, children under 13 must wear a U.S. Coast Guard-approved life jacket on moving boats; some states set different ages.