I am against the insistence on the purely ordinal measurability of happiness only. In fact, I am not only certain that I am happier now than when I was 30-something, I am also absolutely sure that I am now at least 3 times happier than then. It is difficult to be sure that my happiness now is exactly 3.5 or 4.3 times my happiness then. However, I am pretty sure that it is more than 3 times.
Yew-Kwang Ng, ‘Happiness Studies: Ways to Improve Comparability and Some Public Policy Implications’, The Economic Record, vol. 84, no. 265 (June, 2008), p. 256