From the regs book:

Page 66, White-Tailed Deer Youth-Only:

"Age Restriction: In the applicable Special Youth-Only counties, only licensed hunters 16 years of age or younger may hunt deer. Special Hunting License Required (Type 102)."

So, we flip over to page 53, Hunting Licenses and Permits:

"A Hunting License is requiredof any person, regardless of age, who hunts any animal or bird in this state, except as specified below. Non-residents under 17 years of age may purchase and hunt with the Special Resident Hunting License (Type 102)".

"Note: All laws and regulations governing hunter education still apply."

Aha! So we go to page 22, Hunter Education:

"Every hunter (including out of state hunters) born on or after Sept 2, 1971 must successfully complete a Hunter Education Training Course. Minimum age for certification is 12 years and cost is $10."

"If you were born on or after Sept 2, 1971 and you are:
> Under age 12, you must be accompanied.*"

Okay, we scan down the page to find out what the asterisk means...

"*Accompanied means: By a person who is at least 17, who is licensed to hunt in Texas, who has passed hunter education or is exempt (born before Sept 2,1971), and you must be within normal voice control. Proof of certification or deferral is required to be on your person while hunting."

Back to page 53, Hunting licenses and Permits:

"Special Resident Hunting (Type 102): $6 Valid only for residents and non-residents younger than 17 and residents 65 years of age and older. Valid to hunt any legal bird or animal. Stamp endorsement requirement requirements apply to persons 65 and over."

So, as far as I can tell there is no minimum age to be a licensed hunter in Texas.