I've spent my life going back and forth between my native country Japan and various Anglophone countries, so fully bilingual in both. I recently arrived in Singapore, and am hoping to begin learning Mandarin. I'm mid-30s and married.
You teach me Mandarin, I teach you Japanese—how about it? Ideally looking for someone who can write in Chinese as well. Merging reading/writing with speech seems like a quicker route to understanding. Let me know if you might be interested