Better avoid . Green tea or coffee with Irrational combination of herbs are being sold. Better avoid.

Give bio combination 21 no for teething trouble

Yes they can ..

Caffeine should be avoided in old age as it can cause acidity, flatulence, constipation.Instead they can have green tea made of ginger, turmeric, tulsi.Add honey n lemon after bringing to normal temprature.

Avoid green coffee

Yes can be taken

U have not mentioned why u want to use green coffee. Green coffee also contains caffeine. There is much less caffeine in green coffee than in regular coffee. But green coffee can still cause caffeine-related side effects similar to coffee. Caffeine can cause insomnia, nervousness and restlessness, stomach upset, nausea and vomiting, increased heart and breathing rate, and other side effects. Consuming large amounts of coffee might also cause headache, anxiety, agitation, ringing in the ears, and irregular heartbeats. Do once in a while is ok but not too much