Probably a better site for information on the SEAL program is:
Navy SEALs : Special Operations: Careers & Jobs: Navy.com
Qualifications
By law, only men are eligible to apply for the SEAL program. Upon joining the Navy, you must:
Meet specific eyesight requirements: 20/40 best eye; 20/70 worst eye; correctable to 20/25 with no color blindness
Meet the minimum Armed Services Vocational Aptitude Battery (ASVAB) score: GS+MC+EI=165 or VE+MK+MC+CS=220
Be 28 years old or younger
Be a U.S. citizen
Pass a physical examination required for divers
It looks like you join up as a SEAL. Well I never. Every day's a school day.
Duncs
