I can't see a death registration in Leicester in 1843 for John Lewis - there is one registered in Lutterworth, but he is aged 24.
John Lewin died 1843 - he is aged 89, from Frog Island and buried via All Saints (service) at St Leonards, Leicester on 23 March 1843.
John Lewis, registered 1853 in Leicester RD is said to be aged 79.