Hi, lybrate user, 
•Aging factor indicates various serious health problems, causing fall in RBC counts and hb %, needs further interrogation,  locally. 
•However , You may give him underlying homoeopathic medication till he gets medically, exained, futher:
@ AlfalfaQ -10 drops , thrice with 2tsfl of normal water,  orally. 
@ Zincum met 30ch -5 drops, thrice, simultaneously. 
•Avoid , junk food, alcohol and nicotine. 
•Tke, care.