DP and I have been together 5 years - he's older than me (46) and I'm 34 and pregnant with my first baby.
Finances have always been a bit of an issue for us. We are not struggling for money but are not loaded (teacher and lecturer). But he is a bit 'tight' with money IMO.
We live in his house - a very small biju bungalow / cottage by the sea. He has almost paid off the mortgage over the last 12 years (about 2.5 k left) and so costs are low. Since going on maternity, I pay him £200 per month in bills / rent but also get in most of the food (which cost me about £400 last month but that's another story!!) Previoulsy I was paying £400 a month into a joint account which was used for food, home improvements, joint items and nights out together. He has always said he thinks I'm 'getting a good deal'. I have no claim on this current house whatsoever in the eyes of the law and he 'doesnt believe in marriage' 
As we have a baby on the way, space is maxed out so we may have to consider moving. He's happy to stay in this ex batchelor pad house so I'm really the one pushing it and it's hard work!!. However, what is fair in terms of financing a new house?? He says pay half each. i.e. on a 300,000 house we pay £150,000 each. He would use the equity from his own house and therefore I would be paying the lion's share of the new mortgage. Is this fair?? Am I from some romantic era, when I think everything should go into one pot and the man should 'look after' the woman and children?? Or should it be brutally 'fair' and he should be given credit for his older age and the fact that he has equity in the bag? By living with him for 5 years I have accrued some saings (15k) but not had the chance to get on the housing ladder!
Objective opinions from both male and female perspectives greatly appreciated! Finances are a prennial source of argument debate for us.....