48 the girlfriend bit I think isn't a big issue, if you feel comfortable with it that is.
Anyone saying they loved me, or worse still asking me to tell them I loved them, so early on, is a red flag imo.
Men who make declarations of love and rush into stuff headlong tend to have issues. The Evil Ex was full on from the outset, loved me after 3 weeks. Only after 6 months did he show his true colours. You can be infatuated after a few weeks, but love takes many months to grow.
Agree with Western the 'say you love me' does seem worse than a simple declaration of love. To me it comes across potentially a bit controlling. Obviously tone is everything, might be a heat of the moment thing (I had a ONS once where the bloke kept saying 'I love you' while we were shagging, I found it a bit off-putting!), but it would concern me.