Rider-matched picks
Size-matched gloves picks for 8 year olds, with fit and feature priorities curated for how 8 year olds actually ride.
Verified on Amazon today — prices and availability may vary.

Diamondback
Adult half-finger glove sized by hand circumference — most riders fall in the M-L range.

Woom
Sized XS-XL by hand circumference. Multiple colorways available on the parent listing.
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Eight is a pivotal age for bike sizing — most children this age are on a 20" bike and approaching the transition to 24" wheels. Average-height 8-year-olds (125–130 cm) ride a 20" bike well, while taller children (131+ cm) may be ready for a 24" bike. This is the age where gears become genuinely useful: many 8-year-olds ride longer distances, explore trails, and tackle hills. A 1x7 or 1x8 drivetrain is the best introduction. Hand brakes should be the sole braking system by now, with both front and rear brakes operational. Disc brakes are a nice upgrade if the budget allows — they provide better stopping power in wet conditions and require less hand strength than rim brakes.
Measure hand circumference at the widest point across your palm, just below the knuckles, with the tape snug but not compressing the hand. Exclude the thumb. Most brands size: XS 6–7", S 7–7.5", M 7.5–8", L 8–9", XL 9–10". Italian brands (Castelli, Sportful) often run a half-size small; US brands (Giro, Pearl Izumi) size true. Kids gloves are usually sold by age band — XS (3–5 yrs), S (5–7), M (7–10), L (10–13) — but always cross-check against the brand's circumference chart because hand size varies more than age does.