Section 37 | Personal allowance for those born before 6 April 1938
From legislation.gov.uk
(1)An individual who makes a claim is entitled to a personal allowance of £10,660, or (if greater) the section 35 amount, for a tax year if the individual—
(a)was born before 6 April 1938, and
(b)meets the requirements of section 56 (residence etc).
(2)If the allowance under subsection (1) is greater than the section 35 amount, for an individual whose adjusted net income for the tax year exceeds £27,700, the allowance under subsection (1)—
(a)is reduced by an amount equal to half of that excess income, but
(b)is not reduced below the section 35 amount.
(2A)In this section “the section 35 amount” means the amount of any allowance to which the individual would be entitled under section 35 for the tax year if the individual had been born after 5 April 1948.
(3)For the meaning of “adjusted net income” see section 58.