 On reaching age 50, no more money can be added to the account and eligibility for the 25% bonus ceases, but the account will still earn interest or investment returns.Permitted investments are as for cash or S&S ISAs, and as for them any number of accounts is allowed, but only one account can hold current year money.After the account has been open for at least 12 months, the money can be used for a first home purchased with a mortgage and priced up to £450,000; the money is paid to the conveyancer and can be returned to the ISA if the sale does not complete.