Table 2: Age of subjects involved in 27 studies.

Study Population	Number of Studies	Reference #	Mean Age of Subjects Involved (without standard deviations)
Healthy or Young Subjects	5	[26, 28, 32, 33, 39]	27.63
Post-menopausal Women	1	[40]	55.6
Elderly Subjects	2	[34, 42]	70.91
Pregnant Women	1	[38]	32.7
Depressive Disorder Patients	2	[37, 43]	44.32
Type 2- Diabetes Mellitus	3	[27, 30, 47]	61.5
Cardio-vascular Diseases	9	[29, 35, 36, 41, 44, 45, 46, 48, 51]	64.8
Cancer	2	[25, 31]	54.7
Metabolic Syndrome	2	[41, 49]	53.4