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Buddhist meditation, namely, anapanasati, is for the development of a spiritual happiness that is superior to and requires an absence of sensual pleasure.
Since sexual desires are often a significant obstacle would-be meditators, you might have a head start.
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Anhedonia is a diagnosable medical condition. Please consult a doctor for evaluating your condition. Your spiritual practice might have revealed a medical condition, especially if nothing gives you pleasure. Spiritual practice does lessen craving, yet normally other joys blossom accompanied by happiness in seclusion and meditation. Continued practice should strengthen spiritual bliss. If you are not experiencing spiritual happiness, consult your spiritual teacher as well.
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Great achievement, congratulation. Most don't archive it even after lifetime practice. It's just that it is mostly not for sure, so continue further to a point where possible joy in ordinary work or association with others also fade away and developing Dhamma remains as refuge.
The younger the better. No need to follow the old never ending practitioner.
[Note that this is not given for trade, exchange, stacks or to put into other world binding relations but for an escape from this wheel.]