DLA can only be claimed for children under 16 - anyone over 16 must apply for Personal Independence Payment (PIP).
You can claim DLA for a child as long as you look after them as if you’re their parent. ‘Parent’ includes step-parents, guardians, grandparents, foster-parents, and even older brothers or sisters.
DLA can’t be backdated. The date of your claim will usually be the date the form is received or the date you call the enquiry line (if you return the claim pack within 6 weeks).
It usually takes 40 working days to deal with a DLA claim.
The child may need an assessment to complete the application.