I fantasise about a 67 year old woman i work with called mo

It's natural to have feelings of attraction or admiration towards someone you know, including colleagues. It's important to consider the dynamics of your workplace and the potential implications of pursuing these feelings. If you have a respectful and professional relationship with her, it might be worth exploring the admiration in a platonic way. Remember to prioritize consent and boundaries in any interactions. If you feel comfortable, you could try to get to know her better in a friendly, appropriate context.