Questions regarding NMN dosage and volume

I am a female 68 years old and am very interested to try NMN. It’s quite expensive to take 1 gram per day. Do you think that 1/2 gram per day would suffice for me?

The recommended dosage is 0.5g per day. The optimal dosage is unknown at this point, but is likely to be greater the older you are.
Please see here for full details on dosage.