Charlotte and William Down continued to live in Penarth following the 1911 census. According to the death register of 1933 (second quarter), William Down passed away at age 67. He was survived by wife, Charlotte, step-son William and daughter, Charlotte.
On 14 April 1947, at 140 Plassey Street, Penarth, Charlotte (Ball) Down passed away, at the age of 78. Her death certificate lists Charlotte as the widow of William Down, formerly a railway painter. The cause of death is difficult to make out on the death certificate. It looks like "renalaria", but I haven't been able to locate an appropriate medical term. Given the "renal" prefix, it could possibly be kidney related. The next part of the cause of death reads "by arterior sclerosis", defined as "a chronic disease in which thickening, hardening, and loss of elasticity of the arterial walls result in impaired blood circulation. It develops with aging, and in hypertension, diabetes, hyperlipidemia, and other conditions," (Antiquus Morbis). The cause of death was certified by Ernest F. Guy, M.D. LG Nicholas, son-in-law, present at death, 140 Plassey Street, Penarth, registered the death on 15 April 1947.