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You can try all the measures suggested above to improve semen parameters. But as time is passing fast for you ( age 44) i would suggest you to go for assisted reproductive technologies(ART) like Intrauterine insemination(IUI) if sperm count
permits and ICSI
( even if count is very less). As age increases, quality of semen and eggs (women) also deteriorates. Consult an infertility
specialist. Your wife also need to be evaluated thoroughly and then treatment decision can be taken. take care.