There is no minimum age as long as you meet the Social Security definition of disabled, and you have sufficient work to qualify for benefits.
To qualify for disability benefits, you must have worked under Social Security long enough to earn the required number of work credits. You can earn up to a maximum of four work credits each year. The amount of earnings required for a credit increases each year as general wage levels go up. Currently, the amount is $1,200.
The number of work credits you need for disability benefits depends on the age you become disabled. For example, if you are under age 24, you may qualify with as little as six credits of coverage. However, people disabled at age 31 or older generally need between 20 and 40 credits to qualify, and some of the work must have been recent. For example, you may need to have worked five out of the past 10 years. Learn more at This link: http://socialsecurity.gov/disability/