There is no upper age limit. As long as you receive one of the allowances, you are eligible for the Scheme. Parents or guardians can order a car on behalf of a child aged three years and above, who is receiving HRMC DLA.
To lease a car through Motability, you must have at least 12 months' award length remaining. Only the higher or enhanced rate of the mobility allowance is used.
As of 6th April 2015, the weekly allowance rates are as follows:
The Attendance Allowance cannot be used to lease a car through Motability.